Here are the correct answers for each statement:
- Earth's most recent glacial period ended about 11,500 years ago.
- The Great Oxygenation Event began about 2.3 billion years ago.
- About 160 years ago carbon dioxide began increasing exponentially to unprecedented levels.
So, the filled statements would read:
- Earth's most recent glacial period ended about 11,500 years ago.
- The Great Oxygenation Event began about 2.3 billion years ago.
- About 160 years ago carbon dioxide began increasing exponentially to unprecedented levels.